?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
su.static: link with proto area libs (esp. libc)
[unleashed.git] / kernel / fs / tmpfs / tmp_vnops.c
blob3bc3eaa429d5d3582ee2266886931f6f8f8f0820
1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 /*
28 * Copyright (c) 2015, Joyent, Inc. All rights reserved.
29 * Copyright 2015 Nexenta Systems, Inc. All rights reserved.
30 * Copyright 2016 RackTop Systems.
31 * Copyright (c) 2017 by Delphix. All rights reserved.
32 */
33
34 #include <sys/types.h>
35 #include <sys/param.h>
36 #include <sys/t_lock.h>
37 #include <sys/systm.h>
38 #include <sys/sysmacros.h>
39 #include <sys/user.h>
40 #include <sys/time.h>
41 #include <sys/vfs.h>
42 #include <sys/vnode.h>
43 #include <sys/file.h>
44 #include <sys/fcntl.h>
45 #include <sys/flock.h>
46 #include <sys/kmem.h>
47 #include <sys/uio.h>
48 #include <sys/errno.h>
49 #include <sys/stat.h>
50 #include <sys/cred.h>
51 #include <sys/dirent.h>
52 #include <sys/pathname.h>
53 #include <sys/vmsystm.h>
54 #include <sys/fs/tmp.h>
55 #include <sys/fs/tmpnode.h>
56 #include <sys/mman.h>
57 #include <vm/hat.h>
58 #include <vm/seg_vn.h>
59 #include <vm/seg_map.h>
60 #include <vm/seg.h>
61 #include <vm/anon.h>
62 #include <vm/as.h>
63 #include <vm/page.h>
64 #include <vm/pvn.h>
65 #include <sys/cmn_err.h>
66 #include <sys/debug.h>
67 #include <sys/swap.h>
68 #include <sys/buf.h>
69 #include <sys/vm.h>
70 #include <sys/vtrace.h>
71 #include <sys/policy.h>
72 #include <sys/fs_subr.h>
73
74 static int tmp_getapage(struct vnode *, uoff_t, size_t, uint_t *,
75 page_t **, size_t, struct seg *, caddr_t, enum seg_rw, struct cred *);
76 static int tmp_putapage(struct vnode *, page_t *, uoff_t *, size_t *,
77 int, struct cred *);
78
79 /* ARGSUSED1 */
80 static int
81 tmp_open(struct vnode **vpp, int flag, struct cred *cred, caller_context_t *ct)
82 {
83 /*
84 * swapon to a tmpfs file is not supported so access
85 * is denied on open if VISSWAP is set.
86 */
87 if ((*vpp)->v_flag & VISSWAP)
88 return (EINVAL);
89 return (0);
90 }
91
92 /* ARGSUSED1 */
93 static int
94 tmp_close(
95 struct vnode *vp,
96 int flag,
97 int count,
98 offset_t offset,
99 struct cred *cred,
100 caller_context_t *ct)
101 {
102 cleanlocks(vp, ttoproc(curthread)->p_pid, 0);
103 cleanshares(vp, ttoproc(curthread)->p_pid);
104 return (0);
105 }
106
107 /*
108 * wrtmp does the real work of write requests for tmpfs.
109 */
110 static int
111 wrtmp(
112 struct tmount *tm,
113 struct tmpnode *tp,
114 struct uio *uio,
115 struct cred *cr,
116 struct caller_context *ct)
117 {
118 pgcnt_t pageoffset; /* offset in pages */
119 ulong_t segmap_offset; /* pagesize byte offset into segmap */
120 caddr_t base; /* base of segmap */
121 ssize_t bytes; /* bytes to uiomove */
122 pfn_t pagenumber; /* offset in pages into tmp file */
123 struct vnode *vp;
124 int error = 0;
125 int pagecreate; /* == 1 if we allocated a page */
126 int newpage;
127 rlim64_t limit = uio->uio_llimit;
128 long oresid = uio->uio_resid;
129 timestruc_t now;
130
131 long tn_size_changed = 0;
132 long old_tn_size;
133 long new_tn_size;
134
135 vp = TNTOV(tp);
136 ASSERT(vp->v_type == VREG);
137
138 TRACE_1(TR_FAC_TMPFS, TR_TMPFS_RWTMP_START,
139 "tmp_wrtmp_start:vp %p", vp);
140
141 ASSERT(RW_WRITE_HELD(&tp->tn_contents));
142 ASSERT(RW_WRITE_HELD(&tp->tn_rwlock));
143
144 if (MANDLOCK(vp, tp->tn_mode)) {
145 rw_exit(&tp->tn_contents);
146 /*
147 * tmp_getattr ends up being called by chklock
148 */
149 error = chklock(vp, FWRITE, uio->uio_loffset, uio->uio_resid,
150 uio->uio_fmode, ct);
151 rw_enter(&tp->tn_contents, RW_WRITER);
152 if (error != 0) {
153 TRACE_2(TR_FAC_TMPFS, TR_TMPFS_RWTMP_END,
154 "tmp_wrtmp_end:vp %p error %d", vp, error);
155 return (error);
156 }
157 }
158
159 if (uio->uio_loffset < 0)
160 return (EINVAL);
161
162 if (limit == RLIM64_INFINITY || limit > MAXOFFSET_T)
163 limit = MAXOFFSET_T;
164
165 if (uio->uio_loffset >= limit) {
166 proc_t *p = ttoproc(curthread);
167
168 mutex_enter(&p->p_lock);
169 (void) rctl_action(rctlproc_legacy[RLIMIT_FSIZE], p->p_rctls,
170 p, RCA_UNSAFE_SIGINFO);
171 mutex_exit(&p->p_lock);
172 return (EFBIG);
173 }
174
175 if (uio->uio_loffset >= MAXOFF_T) {
176 TRACE_2(TR_FAC_TMPFS, TR_TMPFS_RWTMP_END,
177 "tmp_wrtmp_end:vp %p error %d", vp, EINVAL);
178 return (EFBIG);
179 }
180
181 if (uio->uio_resid == 0) {
182 TRACE_2(TR_FAC_TMPFS, TR_TMPFS_RWTMP_END,
183 "tmp_wrtmp_end:vp %p error %d", vp, 0);
184 return (0);
185 }
186
187 if (limit > MAXOFF_T)
188 limit = MAXOFF_T;
189
190 do {
191 long offset;
192 long delta;
193
194 offset = (long)uio->uio_offset;
195 pageoffset = offset & PAGEOFFSET;
196 /*
197 * A maximum of PAGESIZE bytes of data is transferred
198 * each pass through this loop
199 */
200 bytes = MIN(PAGESIZE - pageoffset, uio->uio_resid);
201
202 if (offset + bytes >= limit) {
203 if (offset >= limit) {
204 error = EFBIG;
205 goto out;
206 }
207 bytes = limit - offset;
208 }
209 pagenumber = btop(offset);
210
211 /*
212 * delta is the amount of anonymous memory
213 * to reserve for the file.
214 * We always reserve in pagesize increments so
215 * unless we're extending the file into a new page,
216 * we don't need to call tmp_resv.
217 */
218 delta = offset + bytes -
219 P2ROUNDUP_TYPED(tp->tn_size, PAGESIZE, uoff_t);
220 if (delta > 0) {
221 pagecreate = 1;
222 if (tmp_resv(tm, tp, delta, pagecreate)) {
223 /*
224 * Log file system full in the zone that owns
225 * the tmpfs mount, as well as in the global
226 * zone if necessary.
227 */
228 zcmn_err(tm->tm_vfsp->vfs_zone->zone_id,
229 CE_WARN, "%s: File system full, "
230 "swap space limit exceeded",
231 tm->tm_mntpath);
232
233 if (tm->tm_vfsp->vfs_zone->zone_id !=
234 GLOBAL_ZONEID) {
235
236 vfs_t *vfs = tm->tm_vfsp;
237
238 zcmn_err(GLOBAL_ZONEID,
239 CE_WARN, "%s: File system full, "
240 "swap space limit exceeded",
241 vfs->vfs_vnodecovered->v_path);
242 }
243 error = ENOSPC;
244 break;
245 }
246 tmpnode_growmap(tp, (ulong_t)offset + bytes);
247 }
248 /* grow the file to the new length */
249 if (offset + bytes > tp->tn_size) {
250 tn_size_changed = 1;
251 old_tn_size = tp->tn_size;
252 /*
253 * Postpone updating tp->tn_size until uiomove() is
254 * done.
255 */
256 new_tn_size = offset + bytes;
257 }
258 if (bytes == PAGESIZE) {
259 /*
260 * Writing whole page so reading from disk
261 * is a waste
262 */
263 pagecreate = 1;
264 } else {
265 pagecreate = 0;
266 }
267 /*
268 * If writing past EOF or filling in a hole
269 * we need to allocate an anon slot.
270 */
271 if (anon_get_ptr(tp->tn_anon, pagenumber) == NULL) {
272 (void) anon_set_ptr(tp->tn_anon, pagenumber,
273 anon_alloc(vp, ptob(pagenumber)), ANON_SLEEP);
274 pagecreate = 1;
275 tp->tn_nblocks++;
276 }
277
278 /*
279 * We have to drop the contents lock to allow the VM
280 * system to reacquire it in tmp_getpage()
281 */
282 rw_exit(&tp->tn_contents);
283
284 /*
285 * Touch the page and fault it in if it is not in core
286 * before segmap_getmapflt or vpm_data_copy can lock it.
287 * This is to avoid the deadlock if the buffer is mapped
288 * to the same file through mmap which we want to write.
289 */
290 uio_prefaultpages((long)bytes, uio);
291
292 newpage = 0;
293 if (vpm_enable) {
294 /*
295 * Copy data. If new pages are created, part of
296 * the page that is not written will be initizliazed
297 * with zeros.
298 */
299 error = vpm_data_copy(vp, offset, bytes, uio,
300 !pagecreate, &newpage, 1, S_WRITE);
301 } else {
302 /* Get offset within the segmap mapping */
303 segmap_offset = (offset & PAGEMASK) & MAXBOFFSET;
304 base = segmap_getmapflt(segkmap, vp,
305 (offset & MAXBMASK), PAGESIZE, !pagecreate,
306 S_WRITE);
307 }
308
309
310 if (!vpm_enable && pagecreate) {
311 /*
312 * segmap_pagecreate() returns 1 if it calls
313 * page_create_va() to allocate any pages.
314 */
315 newpage = segmap_pagecreate(segkmap,
316 base + segmap_offset, (size_t)PAGESIZE, 0);
317 /*
318 * Clear from the beginning of the page to the starting
319 * offset of the data.
320 */
321 if (pageoffset != 0)
322 (void) kzero(base + segmap_offset,
323 (size_t)pageoffset);
324 }
325
326 if (!vpm_enable) {
327 error = uiomove(base + segmap_offset + pageoffset,
328 (long)bytes, UIO_WRITE, uio);
329 }
330
331 if (!vpm_enable && pagecreate &&
332 uio->uio_offset < P2ROUNDUP(offset + bytes, PAGESIZE)) {
333 long zoffset; /* zero from offset into page */
334 /*
335 * We created pages w/o initializing them completely,
336 * thus we need to zero the part that wasn't set up.
337 * This happens on most EOF write cases and if
338 * we had some sort of error during the uiomove.
339 */
340 long nmoved;
341
342 nmoved = uio->uio_offset - offset;
343 ASSERT((nmoved + pageoffset) <= PAGESIZE);
344
345 /*
346 * Zero from the end of data in the page to the
347 * end of the page.
348 */
349 if ((zoffset = pageoffset + nmoved) < PAGESIZE)
350 (void) kzero(base + segmap_offset + zoffset,
351 (size_t)PAGESIZE - zoffset);
352 }
353
354 /*
355 * Unlock the pages which have been allocated by
356 * page_create_va() in segmap_pagecreate()
357 */
358 if (!vpm_enable && newpage) {
359 segmap_pageunlock(segkmap, base + segmap_offset,
360 (size_t)PAGESIZE, S_WRITE);
361 }
362
363 if (error) {
364 /*
365 * If we failed on a write, we must
366 * be sure to invalidate any pages that may have
367 * been allocated.
368 */
369 if (vpm_enable) {
370 (void) vpm_sync_pages(vp, offset, PAGESIZE,
371 SM_INVAL);
372 } else {
373 (void) segmap_release(segkmap, base, SM_INVAL);
374 }
375 } else {
376 if (vpm_enable) {
377 error = vpm_sync_pages(vp, offset, PAGESIZE,
378 0);
379 } else {
380 error = segmap_release(segkmap, base, 0);
381 }
382 }
383
384 /*
385 * Re-acquire contents lock.
386 */
387 rw_enter(&tp->tn_contents, RW_WRITER);
388
389 /*
390 * Update tn_size.
391 */
392 if (tn_size_changed)
393 tp->tn_size = new_tn_size;
394
395 /*
396 * If the uiomove failed, fix up tn_size.
397 */
398 if (error) {
399 if (tn_size_changed) {
400 /*
401 * The uiomove failed, and we
402 * allocated blocks,so get rid
403 * of them.
404 */
405 (void) tmpnode_trunc(tm, tp,
406 (ulong_t)old_tn_size);
407 }
408 } else {
409 /*
410 * XXX - Can this be out of the loop?
411 */
412 if ((tp->tn_mode & (S_IXUSR | S_IXGRP | S_IXOTH)) &&
413 (tp->tn_mode & (S_ISUID | S_ISGID)) &&
414 secpolicy_vnode_setid_retain(cr,
415 (tp->tn_mode & S_ISUID) != 0 && tp->tn_uid == 0)) {
416 /*
417 * Clear Set-UID & Set-GID bits on
418 * successful write if not privileged
419 * and at least one of the execute bits
420 * is set. If we always clear Set-GID,
421 * mandatory file and record locking is
422 * unuseable.
423 */
424 tp->tn_mode &= ~(S_ISUID | S_ISGID);
425 }
426 gethrestime(&now);
427 tp->tn_mtime = now;
428 tp->tn_ctime = now;
429 }
430 } while (error == 0 && uio->uio_resid > 0 && bytes != 0);
431
432 out:
433 /*
434 * If we've already done a partial-write, terminate
435 * the write but return no error.
436 */
437 if (oresid != uio->uio_resid)
438 error = 0;
439 TRACE_2(TR_FAC_TMPFS, TR_TMPFS_RWTMP_END,
440 "tmp_wrtmp_end:vp %p error %d", vp, error);
441 return (error);
442 }
443
444 /*
445 * rdtmp does the real work of read requests for tmpfs.
446 */
447 static int
448 rdtmp(
449 struct tmount *tm,
450 struct tmpnode *tp,
451 struct uio *uio,
452 struct caller_context *ct)
453 {
454 ulong_t pageoffset; /* offset in tmpfs file (uio_offset) */
455 ulong_t segmap_offset; /* pagesize byte offset into segmap */
456 caddr_t base; /* base of segmap */
457 ssize_t bytes; /* bytes to uiomove */
458 struct vnode *vp;
459 int error;
460 long oresid = uio->uio_resid;
461
462 vp = TNTOV(tp);
463
464 TRACE_1(TR_FAC_TMPFS, TR_TMPFS_RWTMP_START, "tmp_rdtmp_start:vp %p",
465 vp);
466
467 ASSERT(RW_LOCK_HELD(&tp->tn_contents));
468
469 if (MANDLOCK(vp, tp->tn_mode)) {
470 rw_exit(&tp->tn_contents);
471 /*
472 * tmp_getattr ends up being called by chklock
473 */
474 error = chklock(vp, FREAD, uio->uio_loffset, uio->uio_resid,
475 uio->uio_fmode, ct);
476 rw_enter(&tp->tn_contents, RW_READER);
477 if (error != 0) {
478 TRACE_2(TR_FAC_TMPFS, TR_TMPFS_RWTMP_END,
479 "tmp_rdtmp_end:vp %p error %d", vp, error);
480 return (error);
481 }
482 }
483 ASSERT(tp->tn_type == VREG);
484
485 if (uio->uio_loffset >= MAXOFF_T) {
486 TRACE_2(TR_FAC_TMPFS, TR_TMPFS_RWTMP_END,
487 "tmp_rdtmp_end:vp %p error %d", vp, EINVAL);
488 return (0);
489 }
490 if (uio->uio_loffset < 0)
491 return (EINVAL);
492 if (uio->uio_resid == 0) {
493 TRACE_2(TR_FAC_TMPFS, TR_TMPFS_RWTMP_END,
494 "tmp_rdtmp_end:vp %p error %d", vp, 0);
495 return (0);
496 }
497
498 vp = TNTOV(tp);
499
500 do {
501 long diff;
502 long offset;
503
504 offset = uio->uio_offset;
505 pageoffset = offset & PAGEOFFSET;
506 bytes = MIN(PAGESIZE - pageoffset, uio->uio_resid);
507
508 diff = tp->tn_size - offset;
509
510 if (diff <= 0) {
511 error = 0;
512 goto out;
513 }
514 if (diff < bytes)
515 bytes = diff;
516
517 /*
518 * We have to drop the contents lock to allow the VM system
519 * to reacquire it in tmp_getpage() should the uiomove cause a
520 * pagefault.
521 */
522 rw_exit(&tp->tn_contents);
523
524 if (vpm_enable) {
525 /*
526 * Copy data.
527 */
528 error = vpm_data_copy(vp, offset, bytes, uio, 1, NULL,
529 0, S_READ);
530 } else {
531 segmap_offset = (offset & PAGEMASK) & MAXBOFFSET;
532 base = segmap_getmapflt(segkmap, vp, offset & MAXBMASK,
533 bytes, 1, S_READ);
534
535 error = uiomove(base + segmap_offset + pageoffset,
536 (long)bytes, UIO_READ, uio);
537 }
538
539 if (error) {
540 if (vpm_enable) {
541 (void) vpm_sync_pages(vp, offset, PAGESIZE, 0);
542 } else {
543 (void) segmap_release(segkmap, base, 0);
544 }
545 } else {
546 if (vpm_enable) {
547 error = vpm_sync_pages(vp, offset, PAGESIZE,
548 0);
549 } else {
550 error = segmap_release(segkmap, base, 0);
551 }
552 }
553
554 /*
555 * Re-acquire contents lock.
556 */
557 rw_enter(&tp->tn_contents, RW_READER);
558
559 } while (error == 0 && uio->uio_resid > 0);
560
561 out:
562 gethrestime(&tp->tn_atime);
563
564 /*
565 * If we've already done a partial read, terminate
566 * the read but return no error.
567 */
568 if (oresid != uio->uio_resid)
569 error = 0;
570
571 TRACE_2(TR_FAC_TMPFS, TR_TMPFS_RWTMP_END,
572 "tmp_rdtmp_end:vp %x error %d", vp, error);
573 return (error);
574 }
575
576 /* ARGSUSED2 */
577 static int
578 tmp_read(struct vnode *vp, struct uio *uiop, int ioflag, cred_t *cred,
579 struct caller_context *ct)
580 {
581 struct tmpnode *tp = (struct tmpnode *)VTOTN(vp);
582 struct tmount *tm = (struct tmount *)VTOTM(vp);
583 int error;
584
585 /*
586 * We don't currently support reading non-regular files
587 */
588 if (vp->v_type == VDIR)
589 return (EISDIR);
590 if (vp->v_type != VREG)
591 return (EINVAL);
592 /*
593 * tmp_rwlock should have already been called from layers above
594 */
595 ASSERT(RW_READ_HELD(&tp->tn_rwlock));
596
597 rw_enter(&tp->tn_contents, RW_READER);
598
599 error = rdtmp(tm, tp, uiop, ct);
600
601 rw_exit(&tp->tn_contents);
602
603 return (error);
604 }
605
606 static int
607 tmp_write(struct vnode *vp, struct uio *uiop, int ioflag, struct cred *cred,
608 struct caller_context *ct)
609 {
610 struct tmpnode *tp = (struct tmpnode *)VTOTN(vp);
611 struct tmount *tm = (struct tmount *)VTOTM(vp);
612 int error;
613
614 /*
615 * We don't currently support writing to non-regular files
616 */
617 if (vp->v_type != VREG)
618 return (EINVAL); /* XXX EISDIR? */
619
620 /*
621 * tmp_rwlock should have already been called from layers above
622 */
623 ASSERT(RW_WRITE_HELD(&tp->tn_rwlock));
624
625 rw_enter(&tp->tn_contents, RW_WRITER);
626
627 if (ioflag & FAPPEND) {
628 /*
629 * In append mode start at end of file.
630 */
631 uiop->uio_loffset = tp->tn_size;
632 }
633
634 error = wrtmp(tm, tp, uiop, cred, ct);
635
636 rw_exit(&tp->tn_contents);
637
638 return (error);
639 }
640
641 /* ARGSUSED */
642 static int
643 tmp_ioctl(
644 struct vnode *vp,
645 int com,
646 intptr_t data,
647 int flag,
648 struct cred *cred,
649 int *rvalp,
650 caller_context_t *ct)
651 {
652 return (ENOTTY);
653 }
654
655 /* ARGSUSED2 */
656 static int
657 tmp_getattr(
658 struct vnode *vp,
659 struct vattr *vap,
660 int flags,
661 struct cred *cred,
662 caller_context_t *ct)
663 {
664 struct tmpnode *tp = (struct tmpnode *)VTOTN(vp);
665 struct vnode *mvp;
666 struct vattr va;
667 int attrs = 1;
668
669 /*
670 * A special case to handle the root tnode on a diskless nfs
671 * client who may have had its uid and gid inherited
672 * from an nfs vnode with nobody ownership. Likely the
673 * root filesystem. After nfs is fully functional the uid/gid
674 * may be mapable so ask again.
675 * vfsp can't get unmounted because we hold vp.
676 */
677 if (vp->v_flag & VROOT &&
678 (mvp = vp->v_vfsp->vfs_vnodecovered) != NULL) {
679 mutex_enter(&tp->tn_tlock);
680 if (tp->tn_uid == UID_NOBODY || tp->tn_gid == GID_NOBODY) {
681 mutex_exit(&tp->tn_tlock);
682 bzero(&va, sizeof (struct vattr));
683 va.va_mask = VATTR_UID|VATTR_GID;
684 attrs = fop_getattr(mvp, &va, 0, cred, ct);
685 } else {
686 mutex_exit(&tp->tn_tlock);
687 }
688 }
689 mutex_enter(&tp->tn_tlock);
690 if (attrs == 0) {
691 tp->tn_uid = va.va_uid;
692 tp->tn_gid = va.va_gid;
693 }
694 vap->va_type = vp->v_type;
695 vap->va_mode = tp->tn_mode & MODEMASK;
696 vap->va_uid = tp->tn_uid;
697 vap->va_gid = tp->tn_gid;
698 vap->va_fsid = tp->tn_fsid;
699 vap->va_nodeid = (ino64_t)tp->tn_nodeid;
700 vap->va_nlink = tp->tn_nlink;
701 vap->va_size = (uoff_t)tp->tn_size;
702 vap->va_atime = tp->tn_atime;
703 vap->va_mtime = tp->tn_mtime;
704 vap->va_ctime = tp->tn_ctime;
705 vap->va_blksize = PAGESIZE;
706 vap->va_rdev = tp->tn_rdev;
707 vap->va_seq = tp->tn_seq;
708
709 /*
710 * XXX Holes are not taken into account. We could take the time to
711 * run through the anon array looking for allocated slots...
712 */
713 vap->va_nblocks = (fsblkcnt64_t)btodb(ptob(btopr(vap->va_size)));
714 mutex_exit(&tp->tn_tlock);
715 return (0);
716 }
717
718 /*ARGSUSED4*/
719 static int
720 tmp_setattr(
721 struct vnode *vp,
722 struct vattr *vap,
723 int flags,
724 struct cred *cred,
725 caller_context_t *ct)
726 {
727 struct tmount *tm = (struct tmount *)VTOTM(vp);
728 struct tmpnode *tp = (struct tmpnode *)VTOTN(vp);
729 int error = 0;
730 struct vattr *get;
731 long mask;
732
733 /*
734 * Cannot set these attributes
735 */
736 if ((vap->va_mask & VATTR_NOSET) || (vap->va_mask & VATTR_XVATTR))
737 return (EINVAL);
738
739 mutex_enter(&tp->tn_tlock);
740
741 get = &tp->tn_attr;
742 /*
743 * Change file access modes. Must be owner or have sufficient
744 * privileges.
745 */
746 error = secpolicy_vnode_setattr(cred, vp, vap, get, flags, tmp_taccess,
747 tp);
748
749 if (error)
750 goto out;
751
752 mask = vap->va_mask;
753
754 if (mask & VATTR_MODE) {
755 get->va_mode &= S_IFMT;
756 get->va_mode |= vap->va_mode & ~S_IFMT;
757 }
758
759 if (mask & VATTR_UID)
760 get->va_uid = vap->va_uid;
761 if (mask & VATTR_GID)
762 get->va_gid = vap->va_gid;
763 if (mask & VATTR_ATIME)
764 get->va_atime = vap->va_atime;
765 if (mask & VATTR_MTIME)
766 get->va_mtime = vap->va_mtime;
767
768 if (mask & (VATTR_UID | VATTR_GID | VATTR_MODE | VATTR_MTIME))
769 gethrestime(&tp->tn_ctime);
770
771 if (mask & VATTR_SIZE) {
772 ASSERT(vp->v_type != VDIR);
773
774 /* Don't support large files. */
775 if (vap->va_size > MAXOFF_T) {
776 error = EFBIG;
777 goto out;
778 }
779 mutex_exit(&tp->tn_tlock);
780
781 rw_enter(&tp->tn_rwlock, RW_WRITER);
782 rw_enter(&tp->tn_contents, RW_WRITER);
783 error = tmpnode_trunc(tm, tp, (ulong_t)vap->va_size);
784 rw_exit(&tp->tn_contents);
785 rw_exit(&tp->tn_rwlock);
786
787 if (error == 0 && vap->va_size == 0)
788 vnevent_truncate(vp, ct);
789
790 goto out1;
791 }
792 out:
793 mutex_exit(&tp->tn_tlock);
794 out1:
795 return (error);
796 }
797
798 /* ARGSUSED2 */
799 static int
800 tmp_access(
801 struct vnode *vp,
802 int mode,
803 int flags,
804 struct cred *cred,
805 caller_context_t *ct)
806 {
807 struct tmpnode *tp = (struct tmpnode *)VTOTN(vp);
808 int error;
809
810 mutex_enter(&tp->tn_tlock);
811 error = tmp_taccess(tp, mode, cred);
812 mutex_exit(&tp->tn_tlock);
813 return (error);
814 }
815
816 /* ARGSUSED3 */
817 static int
818 tmp_lookup(
819 struct vnode *dvp,
820 char *nm,
821 struct vnode **vpp,
822 struct pathname *pnp,
823 int flags,
824 struct vnode *rdir,
825 struct cred *cred,
826 caller_context_t *ct,
827 int *direntflags,
828 pathname_t *realpnp)
829 {
830 struct tmpnode *tp = (struct tmpnode *)VTOTN(dvp);
831 struct tmpnode *ntp = NULL;
832 int error;
833
834
835 /* allow cd into @ dir */
836 if (flags & LOOKUP_XATTR) {
837 struct tmpnode *xdp;
838 struct tmount *tm;
839
840 /*
841 * don't allow attributes if not mounted XATTR support
842 */
843 if (!(dvp->v_vfsp->vfs_flag & VFS_XATTR))
844 return (EINVAL);
845
846 if (tp->tn_flags & ISXATTR)
847 /* No attributes on attributes */
848 return (EINVAL);
849
850 rw_enter(&tp->tn_rwlock, RW_WRITER);
851 if (tp->tn_xattrdp == NULL) {
852 if (!(flags & CREATE_XATTR_DIR)) {
853 rw_exit(&tp->tn_rwlock);
854 return (ENOENT);
855 }
856
857 /*
858 * No attribute directory exists for this
859 * node - create the attr dir as a side effect
860 * of this lookup.
861 */
862
863 /*
864 * Make sure we have adequate permission...
865 */
866
867 if ((error = tmp_taccess(tp, VWRITE, cred)) != 0) {
868 rw_exit(&tp->tn_rwlock);
869 return (error);
870 }
871
872 xdp = tmp_memalloc(sizeof (struct tmpnode),
873 TMP_MUSTHAVE);
874 tm = VTOTM(dvp);
875 tmpnode_init(tm, xdp, &tp->tn_attr, NULL);
876 /*
877 * Fix-up fields unique to attribute directories.
878 */
879 xdp->tn_flags = ISXATTR;
880 xdp->tn_type = VDIR;
881 if (tp->tn_type == VDIR) {
882 xdp->tn_mode = tp->tn_attr.va_mode;
883 } else {
884 xdp->tn_mode = 0700;
885 if (tp->tn_attr.va_mode & 0040)
886 xdp->tn_mode |= 0750;
887 if (tp->tn_attr.va_mode & 0004)
888 xdp->tn_mode |= 0705;
889 }
890 xdp->tn_vnode->v_type = VDIR;
891 xdp->tn_vnode->v_flag |= V_XATTRDIR;
892 tdirinit(tp, xdp);
893 tp->tn_xattrdp = xdp;
894 } else {
895 VN_HOLD(tp->tn_xattrdp->tn_vnode);
896 }
897 *vpp = TNTOV(tp->tn_xattrdp);
898 rw_exit(&tp->tn_rwlock);
899 return (0);
900 }
901
902 /*
903 * Null component name is a synonym for directory being searched.
904 */
905 if (*nm == '\0') {
906 VN_HOLD(dvp);
907 *vpp = dvp;
908 return (0);
909 }
910 ASSERT(tp);
911
912 error = tdirlookup(tp, nm, &ntp, cred);
913
914 if (error == 0) {
915 ASSERT(ntp);
916 *vpp = TNTOV(ntp);
917 /*
918 * If vnode is a device return special vnode instead
919 */
920 if (IS_DEVVP(*vpp)) {
921 struct vnode *newvp;
922
923 newvp = specvp(*vpp, (*vpp)->v_rdev, (*vpp)->v_type,
924 cred);
925 VN_RELE(*vpp);
926 *vpp = newvp;
927 }
928 }
929 TRACE_4(TR_FAC_TMPFS, TR_TMPFS_LOOKUP,
930 "tmpfs lookup:vp %p name %s vpp %p error %d",
931 dvp, nm, vpp, error);
932 return (error);
933 }
934
935 /*ARGSUSED7*/
936 static int
937 tmp_create(
938 struct vnode *dvp,
939 char *nm,
940 struct vattr *vap,
941 enum vcexcl exclusive,
942 int mode,
943 struct vnode **vpp,
944 struct cred *cred,
945 int flag,
946 caller_context_t *ct,
947 vsecattr_t *vsecp)
948 {
949 struct tmpnode *parent;
950 struct tmount *tm;
951 struct tmpnode *self;
952 int error;
953 struct tmpnode *oldtp;
954
955 again:
956 parent = (struct tmpnode *)VTOTN(dvp);
957 tm = (struct tmount *)VTOTM(dvp);
958 self = NULL;
959 error = 0;
960 oldtp = NULL;
961
962 /* device files not allowed in ext. attr dirs */
963 if ((parent->tn_flags & ISXATTR) &&
964 (vap->va_type == VBLK || vap->va_type == VCHR ||
965 vap->va_type == VFIFO || vap->va_type == VDOOR ||
966 vap->va_type == VSOCK || vap->va_type == VPORT))
967 return (EINVAL);
968
969 if (vap->va_type == VREG && (vap->va_mode & VSVTX)) {
970 /* Must be privileged to set sticky bit */
971 if (secpolicy_vnode_stky_modify(cred))
972 vap->va_mode &= ~VSVTX;
973 } else if (vap->va_type == VNON) {
974 return (EINVAL);
975 }
976
977 /*
978 * Null component name is a synonym for directory being searched.
979 */
980 if (*nm == '\0') {
981 VN_HOLD(dvp);
982 oldtp = parent;
983 } else {
984 error = tdirlookup(parent, nm, &oldtp, cred);
985 }
986
987 if (error == 0) { /* name found */
988 boolean_t trunc = B_FALSE;
989
990 ASSERT(oldtp);
991
992 rw_enter(&oldtp->tn_rwlock, RW_WRITER);
993
994 /*
995 * if create/read-only an existing
996 * directory, allow it
997 */
998 if (exclusive == EXCL)
999 error = EEXIST;
1000 else if ((oldtp->tn_type == VDIR) && (mode & VWRITE))
1001 error = EISDIR;
1002 else {
1003 error = tmp_taccess(oldtp, mode, cred);
1004 }
1005
1006 if (error) {
1007 rw_exit(&oldtp->tn_rwlock);
1008 tmpnode_rele(oldtp);
1009 return (error);
1010 }
1011 *vpp = TNTOV(oldtp);
1012 if ((*vpp)->v_type == VREG && (vap->va_mask & VATTR_SIZE) &&
1013 vap->va_size == 0) {
1014 rw_enter(&oldtp->tn_contents, RW_WRITER);
1015 (void) tmpnode_trunc(tm, oldtp, 0);
1016 rw_exit(&oldtp->tn_contents);
1017 trunc = B_TRUE;
1018 }
1019 rw_exit(&oldtp->tn_rwlock);
1020 if (IS_DEVVP(*vpp)) {
1021 struct vnode *newvp;
1022
1023 newvp = specvp(*vpp, (*vpp)->v_rdev, (*vpp)->v_type,
1024 cred);
1025 VN_RELE(*vpp);
1026 if (newvp == NULL) {
1027 return (ENOSYS);
1028 }
1029 *vpp = newvp;
1030 }
1031
1032 if (trunc)
1033 vnevent_create(*vpp, ct);
1034
1035 return (0);
1036 }
1037
1038 if (error != ENOENT)
1039 return (error);
1040
1041 rw_enter(&parent->tn_rwlock, RW_WRITER);
1042 error = tdirenter(tm, parent, nm, DE_CREATE, NULL, NULL, vap, &self,
1043 cred, ct);
1044 rw_exit(&parent->tn_rwlock);
1045
1046 if (error) {
1047 if (self)
1048 tmpnode_rele(self);
1049
1050 if (error == EEXIST) {
1051 /*
1052 * This means that the file was created sometime
1053 * after we checked and did not find it and when
1054 * we went to create it.
1055 * Since creat() is supposed to truncate a file
1056 * that already exits go back to the begining
1057 * of the function. This time we will find it
1058 * and go down the tmp_trunc() path
1059 */
1060 goto again;
1061 }
1062 return (error);
1063 }
1064
1065 *vpp = TNTOV(self);
1066
1067 if (!error && IS_DEVVP(*vpp)) {
1068 struct vnode *newvp;
1069
1070 newvp = specvp(*vpp, (*vpp)->v_rdev, (*vpp)->v_type, cred);
1071 VN_RELE(*vpp);
1072 if (newvp == NULL)
1073 return (ENOSYS);
1074 *vpp = newvp;
1075 }
1076 TRACE_3(TR_FAC_TMPFS, TR_TMPFS_CREATE,
1077 "tmpfs create:dvp %p nm %s vpp %p", dvp, nm, vpp);
1078 return (0);
1079 }
1080
1081 /* ARGSUSED3 */
1082 static int
1083 tmp_remove(
1084 struct vnode *dvp,
1085 char *nm,
1086 struct cred *cred,
1087 caller_context_t *ct,
1088 int flags)
1089 {
1090 struct tmpnode *parent = (struct tmpnode *)VTOTN(dvp);
1091 int error;
1092 struct tmpnode *tp = NULL;
1093
1094 error = tdirlookup(parent, nm, &tp, cred);
1095 if (error)
1096 return (error);
1097
1098 ASSERT(tp);
1099 rw_enter(&parent->tn_rwlock, RW_WRITER);
1100 rw_enter(&tp->tn_rwlock, RW_WRITER);
1101
1102 error = (tp->tn_type == VDIR) ? EPERM :
1103 tdirdelete(parent, tp, nm, DR_REMOVE, cred);
1104
1105 rw_exit(&tp->tn_rwlock);
1106 rw_exit(&parent->tn_rwlock);
1107 vnevent_remove(TNTOV(tp), dvp, nm, ct);
1108 tmpnode_rele(tp);
1109
1110 TRACE_3(TR_FAC_TMPFS, TR_TMPFS_REMOVE,
1111 "tmpfs remove:dvp %p nm %s error %d", dvp, nm, error);
1112 return (error);
1113 }
1114
1115 /* ARGSUSED4 */
1116 static int
1117 tmp_link(
1118 struct vnode *dvp,
1119 struct vnode *srcvp,
1120 char *tnm,
1121 struct cred *cred,
1122 caller_context_t *ct,
1123 int flags)
1124 {
1125 struct tmpnode *parent;
1126 struct tmpnode *from;
1127 struct tmount *tm = (struct tmount *)VTOTM(dvp);
1128 int error;
1129 struct tmpnode *found = NULL;
1130 struct vnode *realvp;
1131
1132 if (fop_realvp(srcvp, &realvp, ct) == 0)
1133 srcvp = realvp;
1134
1135 parent = (struct tmpnode *)VTOTN(dvp);
1136 from = (struct tmpnode *)VTOTN(srcvp);
1137
1138 if (srcvp->v_type == VDIR ||
1139 (from->tn_uid != crgetuid(cred) && secpolicy_basic_link(cred)))
1140 return (EPERM);
1141
1142 /*
1143 * Make sure link for extended attributes is valid
1144 * We only support hard linking of xattr's in xattrdir to an xattrdir
1145 */
1146 if ((from->tn_flags & ISXATTR) != (parent->tn_flags & ISXATTR))
1147 return (EINVAL);
1148
1149 error = tdirlookup(parent, tnm, &found, cred);
1150 if (error == 0) {
1151 ASSERT(found);
1152 tmpnode_rele(found);
1153 return (EEXIST);
1154 }
1155
1156 if (error != ENOENT)
1157 return (error);
1158
1159 rw_enter(&parent->tn_rwlock, RW_WRITER);
1160 error = tdirenter(tm, parent, tnm, DE_LINK, NULL,
1161 from, NULL, (struct tmpnode **)NULL, cred, ct);
1162 rw_exit(&parent->tn_rwlock);
1163 if (error == 0) {
1164 vnevent_link(srcvp, ct);
1165 }
1166 return (error);
1167 }
1168
1169 /* ARGSUSED5 */
1170 static int
1171 tmp_rename(
1172 struct vnode *odvp, /* source parent vnode */
1173 char *onm, /* source name */
1174 struct vnode *ndvp, /* destination parent vnode */
1175 char *nnm, /* destination name */
1176 struct cred *cred,
1177 caller_context_t *ct,
1178 int flags)
1179 {
1180 struct tmpnode *fromparent;
1181 struct tmpnode *toparent;
1182 struct tmpnode *fromtp = NULL; /* source tmpnode */
1183 struct tmpnode *totp; /* target tmpnode */
1184 struct tmount *tm = (struct tmount *)VTOTM(odvp);
1185 int error;
1186 int samedir = 0; /* set if odvp == ndvp */
1187 struct vnode *realvp;
1188
1189 if (fop_realvp(ndvp, &realvp, ct) == 0)
1190 ndvp = realvp;
1191
1192 fromparent = (struct tmpnode *)VTOTN(odvp);
1193 toparent = (struct tmpnode *)VTOTN(ndvp);
1194
1195 if ((fromparent->tn_flags & ISXATTR) != (toparent->tn_flags & ISXATTR))
1196 return (EINVAL);
1197
1198 mutex_enter(&tm->tm_renamelck);
1199
1200 /*
1201 * Look up tmpnode of file we're supposed to rename.
1202 */
1203 error = tdirlookup(fromparent, onm, &fromtp, cred);
1204 if (error) {
1205 mutex_exit(&tm->tm_renamelck);
1206 return (error);
1207 }
1208
1209 /*
1210 * Make sure we can delete the old (source) entry. This
1211 * requires write permission on the containing directory. If
1212 * that directory is "sticky" it requires further checks.
1213 */
1214 if (((error = tmp_taccess(fromparent, VWRITE, cred)) != 0) ||
1215 (error = tmp_sticky_remove_access(fromparent, fromtp, cred)) != 0)
1216 goto done;
1217
1218 /*
1219 * Check for renaming to or from '.' or '..' or that
1220 * fromtp == fromparent
1221 */
1222 if ((onm[0] == '.' &&
1223 (onm[1] == '\0' || (onm[1] == '.' && onm[2] == '\0'))) ||
1224 (nnm[0] == '.' &&
1225 (nnm[1] == '\0' || (nnm[1] == '.' && nnm[2] == '\0'))) ||
1226 (fromparent == fromtp)) {
1227 error = EINVAL;
1228 goto done;
1229 }
1230
1231 samedir = (fromparent == toparent);
1232 /*
1233 * Make sure we can search and rename into the new
1234 * (destination) directory.
1235 */
1236 if (!samedir) {
1237 error = tmp_taccess(toparent, VEXEC|VWRITE, cred);
1238 if (error)
1239 goto done;
1240 }
1241
1242 if (tdirlookup(toparent, nnm, &totp, cred) == 0) {
1243 vnevent_pre_rename_dest(TNTOV(totp), ndvp, nnm, ct);
1244 tmpnode_rele(totp);
1245 }
1246
1247 /* Notify the target dir. if not the same as the source dir. */
1248 if (ndvp != odvp) {
1249 vnevent_pre_rename_dest_dir(ndvp, TNTOV(fromtp), nnm, ct);
1250 }
1251
1252 vnevent_pre_rename_src(TNTOV(fromtp), odvp, onm, ct);
1253
1254 /*
1255 * Link source to new target
1256 */
1257 rw_enter(&toparent->tn_rwlock, RW_WRITER);
1258 error = tdirenter(tm, toparent, nnm, DE_RENAME,
1259 fromparent, fromtp, NULL, (struct tmpnode **)NULL, cred, ct);
1260 rw_exit(&toparent->tn_rwlock);
1261
1262 if (error) {
1263 /*
1264 * ESAME isn't really an error; it indicates that the
1265 * operation should not be done because the source and target
1266 * are the same file, but that no error should be reported.
1267 */
1268 if (error == ESAME)
1269 error = 0;
1270 goto done;
1271 }
1272
1273 /*
1274 * Unlink from source.
1275 */
1276 rw_enter(&fromparent->tn_rwlock, RW_WRITER);
1277 rw_enter(&fromtp->tn_rwlock, RW_WRITER);
1278
1279 error = tdirdelete(fromparent, fromtp, onm, DR_RENAME, cred);
1280
1281 /*
1282 * The following handles the case where our source tmpnode was
1283 * removed before we got to it.
1284 *
1285 * XXX We should also cleanup properly in the case where tdirdelete
1286 * fails for some other reason. Currently this case shouldn't happen.
1287 * (see 1184991).
1288 */
1289 if (error == ENOENT)
1290 error = 0;
1291
1292 rw_exit(&fromtp->tn_rwlock);
1293 rw_exit(&fromparent->tn_rwlock);
1294
1295 if (error == 0) {
1296 vnevent_rename_src(TNTOV(fromtp), odvp, onm, ct);
1297 /*
1298 * vnevent_rename_dest is called in tdirenter().
1299 * Notify the target dir if not same as source dir.
1300 */
1301 if (ndvp != odvp)
1302 vnevent_rename_dest_dir(ndvp, ct);
1303 }
1304
1305 done:
1306 tmpnode_rele(fromtp);
1307 mutex_exit(&tm->tm_renamelck);
1308
1309 TRACE_5(TR_FAC_TMPFS, TR_TMPFS_RENAME,
1310 "tmpfs rename:ovp %p onm %s nvp %p nnm %s error %d", odvp, onm,
1311 ndvp, nnm, error);
1312 return (error);
1313 }
1314
1315 /* ARGSUSED5 */
1316 static int
1317 tmp_mkdir(
1318 struct vnode *dvp,
1319 char *nm,
1320 struct vattr *va,
1321 struct vnode **vpp,
1322 struct cred *cred,
1323 caller_context_t *ct,
1324 int flags,
1325 vsecattr_t *vsecp)
1326 {
1327 struct tmpnode *parent = (struct tmpnode *)VTOTN(dvp);
1328 struct tmpnode *self = NULL;
1329 struct tmount *tm = (struct tmount *)VTOTM(dvp);
1330 int error;
1331
1332 /* no new dirs allowed in xattr dirs */
1333 if (parent->tn_flags & ISXATTR)
1334 return (EINVAL);
1335
1336 /*
1337 * Might be dangling directory. Catch it here,
1338 * because a ENOENT return from tdirlookup() is
1339 * an "o.k. return".
1340 */
1341 if (parent->tn_nlink == 0)
1342 return (ENOENT);
1343
1344 error = tdirlookup(parent, nm, &self, cred);
1345 if (error == 0) {
1346 ASSERT(self);
1347 tmpnode_rele(self);
1348 return (EEXIST);
1349 }
1350 if (error != ENOENT)
1351 return (error);
1352
1353 rw_enter(&parent->tn_rwlock, RW_WRITER);
1354 error = tdirenter(tm, parent, nm, DE_MKDIR, NULL,
1355 NULL, va, &self, cred, ct);
1356 if (error) {
1357 rw_exit(&parent->tn_rwlock);
1358 if (self)
1359 tmpnode_rele(self);
1360 return (error);
1361 }
1362 rw_exit(&parent->tn_rwlock);
1363 *vpp = TNTOV(self);
1364 return (0);
1365 }
1366
1367 /* ARGSUSED4 */
1368 static int
1369 tmp_rmdir(
1370 struct vnode *dvp,
1371 char *nm,
1372 struct vnode *cdir,
1373 struct cred *cred,
1374 caller_context_t *ct,
1375 int flags)
1376 {
1377 struct tmpnode *parent = (struct tmpnode *)VTOTN(dvp);
1378 struct tmpnode *self = NULL;
1379 struct vnode *vp;
1380 int error = 0;
1381
1382 /*
1383 * Return error when removing . and ..
1384 */
1385 if (strcmp(nm, ".") == 0)
1386 return (EINVAL);
1387 if (strcmp(nm, "..") == 0)
1388 return (EEXIST); /* Should be ENOTEMPTY */
1389 error = tdirlookup(parent, nm, &self, cred);
1390 if (error)
1391 return (error);
1392
1393 rw_enter(&parent->tn_rwlock, RW_WRITER);
1394 rw_enter(&self->tn_rwlock, RW_WRITER);
1395
1396 vp = TNTOV(self);
1397 if (vp == dvp || vp == cdir) {
1398 error = EINVAL;
1399 goto done1;
1400 }
1401 if (self->tn_type != VDIR) {
1402 error = ENOTDIR;
1403 goto done1;
1404 }
1405
1406 mutex_enter(&self->tn_tlock);
1407 if (self->tn_nlink > 2) {
1408 mutex_exit(&self->tn_tlock);
1409 error = EEXIST;
1410 goto done1;
1411 }
1412 mutex_exit(&self->tn_tlock);
1413
1414 if (vn_vfswlock(vp)) {
1415 error = EBUSY;
1416 goto done1;
1417 }
1418 if (vn_mountedvfs(vp) != NULL) {
1419 error = EBUSY;
1420 goto done;
1421 }
1422
1423 /*
1424 * Check for an empty directory
1425 * i.e. only includes entries for "." and ".."
1426 */
1427 if (self->tn_dirents > 2) {
1428 error = EEXIST; /* SIGH should be ENOTEMPTY */
1429 /*
1430 * Update atime because checking tn_dirents is logically
1431 * equivalent to reading the directory
1432 */
1433 gethrestime(&self->tn_atime);
1434 goto done;
1435 }
1436
1437 error = tdirdelete(parent, self, nm, DR_RMDIR, cred);
1438 done:
1439 vn_vfsunlock(vp);
1440 done1:
1441 rw_exit(&self->tn_rwlock);
1442 rw_exit(&parent->tn_rwlock);
1443 vnevent_rmdir(TNTOV(self), dvp, nm, ct);
1444 tmpnode_rele(self);
1445
1446 return (error);
1447 }
1448
1449 /* ARGSUSED2 */
1450 static int
1451 tmp_readdir(
1452 struct vnode *vp,
1453 struct uio *uiop,
1454 struct cred *cred,
1455 int *eofp,
1456 caller_context_t *ct,
1457 int flags)
1458 {
1459 struct tmpnode *tp = (struct tmpnode *)VTOTN(vp);
1460 struct tdirent *tdp;
1461 int error = 0;
1462 size_t namelen;
1463 struct dirent64 *dp;
1464 ulong_t offset;
1465 ulong_t total_bytes_wanted;
1466 long outcount = 0;
1467 long bufsize;
1468 int reclen;
1469 caddr_t outbuf;
1470
1471 if (uiop->uio_loffset >= MAXOFF_T) {
1472 if (eofp)
1473 *eofp = 1;
1474 return (0);
1475 }
1476 /*
1477 * assuming system call has already called tmp_rwlock
1478 */
1479 ASSERT(RW_READ_HELD(&tp->tn_rwlock));
1480
1481 if (uiop->uio_iovcnt != 1)
1482 return (EINVAL);
1483
1484 if (vp->v_type != VDIR)
1485 return (ENOTDIR);
1486
1487 /*
1488 * There's a window here where someone could have removed
1489 * all the entries in the directory after we put a hold on the
1490 * vnode but before we grabbed the rwlock. Just return.
1491 */
1492 if (tp->tn_dir == NULL) {
1493 if (tp->tn_nlink) {
1494 panic("empty directory 0x%p", (void *)tp);
1495 /*NOTREACHED*/
1496 }
1497 return (0);
1498 }
1499
1500 /*
1501 * Get space for multiple directory entries
1502 */
1503 total_bytes_wanted = uiop->uio_iov->iov_len;
1504 bufsize = total_bytes_wanted + sizeof (struct dirent64);
1505 outbuf = kmem_alloc(bufsize, KM_SLEEP);
1506
1507 dp = (struct dirent64 *)outbuf;
1508
1509
1510 offset = 0;
1511 tdp = tp->tn_dir;
1512 while (tdp) {
1513 namelen = strlen(tdp->td_name); /* no +1 needed */
1514 offset = tdp->td_offset;
1515 if (offset >= uiop->uio_offset) {
1516 reclen = (int)DIRENT64_RECLEN(namelen);
1517 if (outcount + reclen > total_bytes_wanted) {
1518 if (!outcount)
1519 /*
1520 * Buffer too small for any entries.
1521 */
1522 error = EINVAL;
1523 break;
1524 }
1525 ASSERT(tdp->td_tmpnode != NULL);
1526
1527 /* use strncpy(9f) to zero out uninitialized bytes */
1528
1529 (void) strncpy(dp->d_name, tdp->td_name,
1530 DIRENT64_NAMELEN(reclen));
1531 dp->d_reclen = (ushort_t)reclen;
1532 dp->d_ino = (ino64_t)tdp->td_tmpnode->tn_nodeid;
1533 dp->d_off = (offset_t)tdp->td_offset + 1;
1534 dp = (struct dirent64 *)
1535 ((uintptr_t)dp + dp->d_reclen);
1536 outcount += reclen;
1537 ASSERT(outcount <= bufsize);
1538 }
1539 tdp = tdp->td_next;
1540 }
1541
1542 if (!error)
1543 error = uiomove(outbuf, outcount, UIO_READ, uiop);
1544
1545 if (!error) {
1546 /* If we reached the end of the list our offset */
1547 /* should now be just past the end. */
1548 if (!tdp) {
1549 offset += 1;
1550 if (eofp)
1551 *eofp = 1;
1552 } else if (eofp)
1553 *eofp = 0;
1554 uiop->uio_offset = offset;
1555 }
1556 gethrestime(&tp->tn_atime);
1557 kmem_free(outbuf, bufsize);
1558 return (error);
1559 }
1560
1561 /* ARGSUSED5 */
1562 static int
1563 tmp_symlink(
1564 struct vnode *dvp,
1565 char *lnm,
1566 struct vattr *tva,
1567 char *tnm,
1568 struct cred *cred,
1569 caller_context_t *ct,
1570 int flags)
1571 {
1572 struct tmpnode *parent = (struct tmpnode *)VTOTN(dvp);
1573 struct tmpnode *self = NULL;
1574 struct tmount *tm = (struct tmount *)VTOTM(dvp);
1575 char *cp = NULL;
1576 int error;
1577 size_t len;
1578
1579 /* no symlinks allowed to files in xattr dirs */
1580 if (parent->tn_flags & ISXATTR)
1581 return (EINVAL);
1582
1583 error = tdirlookup(parent, lnm, &self, cred);
1584 if (error == 0) {
1585 /*
1586 * The entry already exists
1587 */
1588 tmpnode_rele(self);
1589 return (EEXIST); /* was 0 */
1590 }
1591
1592 if (error != ENOENT) {
1593 if (self != NULL)
1594 tmpnode_rele(self);
1595 return (error);
1596 }
1597
1598 rw_enter(&parent->tn_rwlock, RW_WRITER);
1599 error = tdirenter(tm, parent, lnm, DE_CREATE, NULL,
1600 NULL, tva, &self, cred, ct);
1601 rw_exit(&parent->tn_rwlock);
1602
1603 if (error) {
1604 if (self)
1605 tmpnode_rele(self);
1606 return (error);
1607 }
1608 len = strlen(tnm) + 1;
1609 cp = tmp_memalloc(len, 0);
1610 if (cp == NULL) {
1611 tmpnode_rele(self);
1612 return (ENOSPC);
1613 }
1614 (void) strcpy(cp, tnm);
1615
1616 self->tn_symlink = cp;
1617 self->tn_size = len - 1;
1618 tmpnode_rele(self);
1619 return (error);
1620 }
1621
1622 /* ARGSUSED2 */
1623 static int
1624 tmp_readlink(
1625 struct vnode *vp,
1626 struct uio *uiop,
1627 struct cred *cred,
1628 caller_context_t *ct)
1629 {
1630 struct tmpnode *tp = (struct tmpnode *)VTOTN(vp);
1631 int error = 0;
1632
1633 if (vp->v_type != VLNK)
1634 return (EINVAL);
1635
1636 rw_enter(&tp->tn_rwlock, RW_READER);
1637 rw_enter(&tp->tn_contents, RW_READER);
1638 error = uiomove(tp->tn_symlink, tp->tn_size, UIO_READ, uiop);
1639 gethrestime(&tp->tn_atime);
1640 rw_exit(&tp->tn_contents);
1641 rw_exit(&tp->tn_rwlock);
1642 return (error);
1643 }
1644
1645 /* ARGSUSED */
1646 static int
1647 tmp_fsync(
1648 struct vnode *vp,
1649 int syncflag,
1650 struct cred *cred,
1651 caller_context_t *ct)
1652 {
1653 return (0);
1654 }
1655
1656 /* ARGSUSED */
1657 static void
1658 tmp_inactive(struct vnode *vp, struct cred *cred, caller_context_t *ct)
1659 {
1660 struct tmpnode *tp = (struct tmpnode *)VTOTN(vp);
1661 struct tmount *tm = (struct tmount *)VFSTOTM(vp->v_vfsp);
1662
1663 rw_enter(&tp->tn_rwlock, RW_WRITER);
1664 top:
1665 mutex_enter(&tp->tn_tlock);
1666 mutex_enter(&vp->v_lock);
1667 ASSERT(vp->v_count >= 1);
1668
1669 /*
1670 * If we don't have the last hold or the link count is non-zero,
1671 * there's little to do -- just drop our hold.
1672 */
1673 if (vp->v_count > 1 || tp->tn_nlink != 0) {
1674 VN_RELE_LOCKED(vp);
1675 mutex_exit(&vp->v_lock);
1676 mutex_exit(&tp->tn_tlock);
1677 rw_exit(&tp->tn_rwlock);
1678 return;
1679 }
1680
1681 /*
1682 * We have the last hold *and* the link count is zero, so this
1683 * tmpnode is dead from the filesystem's viewpoint. However,
1684 * if the tmpnode has any pages associated with it (i.e. if it's
1685 * a normal file with non-zero size), the tmpnode can still be
1686 * discovered by pageout or fsflush via the page vnode pointers.
1687 * In this case we must drop all our locks, truncate the tmpnode,
1688 * and try the whole dance again.
1689 */
1690 if (tp->tn_size != 0) {
1691 if (tp->tn_type == VREG) {
1692 mutex_exit(&vp->v_lock);
1693 mutex_exit(&tp->tn_tlock);
1694 rw_enter(&tp->tn_contents, RW_WRITER);
1695 (void) tmpnode_trunc(tm, tp, 0);
1696 rw_exit(&tp->tn_contents);
1697 ASSERT(tp->tn_size == 0);
1698 ASSERT(tp->tn_nblocks == 0);
1699 goto top;
1700 }
1701 if (tp->tn_type == VLNK)
1702 tmp_memfree(tp->tn_symlink, tp->tn_size + 1);
1703 }
1704
1705 /*
1706 * Remove normal file/dir's xattr dir and xattrs.
1707 */
1708 if (tp->tn_xattrdp) {
1709 struct tmpnode *xtp = tp->tn_xattrdp;
1710
1711 ASSERT(xtp->tn_flags & ISXATTR);
1712 tmpnode_hold(xtp);
1713 rw_enter(&xtp->tn_rwlock, RW_WRITER);
1714 tdirtrunc(xtp);
1715 DECR_COUNT(&xtp->tn_nlink, &xtp->tn_tlock);
1716 tp->tn_xattrdp = NULL;
1717 rw_exit(&xtp->tn_rwlock);
1718 tmpnode_rele(xtp);
1719 }
1720
1721 mutex_exit(&vp->v_lock);
1722 mutex_exit(&tp->tn_tlock);
1723 /* Here's our chance to send invalid event while we're between locks */
1724 vn_invalid(TNTOV(tp));
1725 mutex_enter(&tm->tm_contents);
1726 if (tp->tn_forw == NULL)
1727 tm->tm_rootnode->tn_back = tp->tn_back;
1728 else
1729 tp->tn_forw->tn_back = tp->tn_back;
1730 tp->tn_back->tn_forw = tp->tn_forw;
1731 mutex_exit(&tm->tm_contents);
1732 rw_exit(&tp->tn_rwlock);
1733 rw_destroy(&tp->tn_rwlock);
1734 mutex_destroy(&tp->tn_tlock);
1735 vn_free(TNTOV(tp));
1736 tmp_memfree(tp, sizeof (struct tmpnode));
1737 }
1738
1739 /* ARGSUSED2 */
1740 static int
1741 tmp_fid(struct vnode *vp, struct fid *fidp, caller_context_t *ct)
1742 {
1743 struct tmpnode *tp = (struct tmpnode *)VTOTN(vp);
1744 struct tfid *tfid;
1745
1746 if (fidp->fid_len < (sizeof (struct tfid) - sizeof (ushort_t))) {
1747 fidp->fid_len = sizeof (struct tfid) - sizeof (ushort_t);
1748 return (ENOSPC);
1749 }
1750
1751 tfid = (struct tfid *)fidp;
1752 bzero(tfid, sizeof (struct tfid));
1753 tfid->tfid_len = (int)sizeof (struct tfid) - sizeof (ushort_t);
1754
1755 tfid->tfid_ino = tp->tn_nodeid;
1756 tfid->tfid_gen = tp->tn_gen;
1757
1758 return (0);
1759 }
1760
1761
1762 /*
1763 * Return all the pages from [off..off+len] in given file
1764 */
1765 /* ARGSUSED */
1766 static int
1767 tmp_getpage(
1768 struct vnode *vp,
1769 offset_t off,
1770 size_t len,
1771 uint_t *protp,
1772 page_t *pl[],
1773 size_t plsz,
1774 struct seg *seg,
1775 caddr_t addr,
1776 enum seg_rw rw,
1777 struct cred *cr,
1778 caller_context_t *ct)
1779 {
1780 int err = 0;
1781 struct tmpnode *tp = VTOTN(vp);
1782 anoff_t toff = (anoff_t)off;
1783 size_t tlen = len;
1784 uoff_t tmpoff;
1785 timestruc_t now;
1786
1787 rw_enter(&tp->tn_contents, RW_READER);
1788
1789 if (off + len > tp->tn_size + PAGEOFFSET) {
1790 err = EFAULT;
1791 goto out;
1792 }
1793 /*
1794 * Look for holes (no anon slot) in faulting range. If there are
1795 * holes we have to switch to a write lock and fill them in. Swap
1796 * space for holes was already reserved when the file was grown.
1797 */
1798 tmpoff = toff;
1799 if (non_anon(tp->tn_anon, btop(off), &tmpoff, &tlen)) {
1800 if (!rw_tryupgrade(&tp->tn_contents)) {
1801 rw_exit(&tp->tn_contents);
1802 rw_enter(&tp->tn_contents, RW_WRITER);
1803 /* Size may have changed when lock was dropped */
1804 if (off + len > tp->tn_size + PAGEOFFSET) {
1805 err = EFAULT;
1806 goto out;
1807 }
1808 }
1809 for (toff = (anoff_t)off; toff < (anoff_t)off + len;
1810 toff += PAGESIZE) {
1811 if (anon_get_ptr(tp->tn_anon, btop(toff)) == NULL) {
1812 /* XXX - may allocate mem w. write lock held */
1813 (void) anon_set_ptr(tp->tn_anon, btop(toff),
1814 anon_alloc(vp, toff), ANON_SLEEP);
1815 tp->tn_nblocks++;
1816 }
1817 }
1818 rw_downgrade(&tp->tn_contents);
1819 }
1820
1821
1822 err = pvn_getpages(tmp_getapage, vp, (uoff_t)off, len, protp,
1823 pl, plsz, seg, addr, rw, cr);
1824
1825 gethrestime(&now);
1826 tp->tn_atime = now;
1827 if (rw == S_WRITE)
1828 tp->tn_mtime = now;
1829
1830 out:
1831 rw_exit(&tp->tn_contents);
1832 return (err);
1833 }
1834
1835 /*
1836 * Called from pvn_getpages to get a particular page.
1837 */
1838 /*ARGSUSED*/
1839 static int
1840 tmp_getapage(
1841 struct vnode *vp,
1842 uoff_t off,
1843 size_t len,
1844 uint_t *protp,
1845 page_t *pl[],
1846 size_t plsz,
1847 struct seg *seg,
1848 caddr_t addr,
1849 enum seg_rw rw,
1850 struct cred *cr)
1851 {
1852 struct page *pp;
1853 int flags;
1854 int err = 0;
1855 struct vnode *pvp;
1856 uoff_t poff;
1857
1858 if (protp != NULL)
1859 *protp = PROT_ALL;
1860 again:
1861 if (pp = page_lookup(&vp->v_object, off, rw == S_CREATE ? SE_EXCL : SE_SHARED)) {
1862 if (pl) {
1863 pl[0] = pp;
1864 pl[1] = NULL;
1865 } else {
1866 page_unlock(pp);
1867 }
1868 } else {
1869 pp = page_create_va(&vp->v_object, off, PAGESIZE,
1870 PG_WAIT | PG_EXCL, seg, addr);
1871 /*
1872 * Someone raced in and created the page after we did the
1873 * lookup but before we did the create, so go back and
1874 * try to look it up again.
1875 */
1876 if (pp == NULL)
1877 goto again;
1878 /*
1879 * Fill page from backing store, if any. If none, then
1880 * either this is a newly filled hole or page must have
1881 * been unmodified and freed so just zero it out.
1882 */
1883 err = swap_getphysname(vp, off, &pvp, &poff);
1884 if (err) {
1885 panic("tmp_getapage: no anon slot vp %p "
1886 "off %llx pp %p\n", (void *)vp, off, (void *)pp);
1887 }
1888 if (pvp) {
1889 flags = (pl == NULL ? B_ASYNC|B_READ : B_READ);
1890 err = fop_pageio(pvp, pp, (uoff_t)poff, PAGESIZE,
1891 flags, cr, NULL);
1892 if (flags & B_ASYNC)
1893 pp = NULL;
1894 } else if (rw != S_CREATE) {
1895 pagezero(pp, 0, PAGESIZE);
1896 }
1897 if (err && pp)
1898 pvn_read_done(pp, B_ERROR);
1899 if (err == 0) {
1900 if (pl)
1901 pvn_plist_init(pp, pl, plsz, off, PAGESIZE, rw);
1902 else
1903 pvn_io_done(pp);
1904 }
1905 }
1906 return (err);
1907 }
1908
1909
1910 /*
1911 * Flags are composed of {B_INVAL, B_DIRTY B_FREE, B_DONTNEED}.
1912 * If len == 0, do from off to EOF.
1913 */
1914 static int tmp_nopage = 0; /* Don't do tmp_putpage's if set */
1915
1916 /* ARGSUSED */
1917 int
1918 tmp_putpage(
1919 register struct vnode *vp,
1920 offset_t off,
1921 size_t len,
1922 int flags,
1923 struct cred *cr,
1924 caller_context_t *ct)
1925 {
1926 register page_t *pp;
1927 uoff_t io_off;
1928 size_t io_len = 0;
1929 int err = 0;
1930 struct tmpnode *tp = VTOTN(vp);
1931 int dolock;
1932
1933 if (tmp_nopage)
1934 return (0);
1935
1936 ASSERT(vp->v_count != 0);
1937
1938 if (vp->v_flag & VNOMAP)
1939 return (ENOSYS);
1940
1941 /*
1942 * This being tmpfs, we don't ever do i/o unless we really
1943 * have to (when we're low on memory and pageout calls us
1944 * with B_ASYNC | B_FREE or the user explicitly asks for it with
1945 * B_DONTNEED).
1946 * XXX to approximately track the mod time like ufs we should
1947 * update the times here. The problem is, once someone does a
1948 * store we never clear the mod bit and do i/o, thus fsflush
1949 * will keep calling us every 30 seconds to do the i/o and we'll
1950 * continually update the mod time. At least we update the mod
1951 * time on the first store because this results in a call to getpage.
1952 */
1953 if (flags != (B_ASYNC | B_FREE) && (flags & B_INVAL) == 0 &&
1954 (flags & B_DONTNEED) == 0)
1955 return (0);
1956 /*
1957 * If this thread owns the lock, i.e., this thread grabbed it
1958 * as writer somewhere above, then we don't need to grab the
1959 * lock as reader in this routine.
1960 */
1961 dolock = (rw_owner(&tp->tn_contents) != curthread);
1962
1963 /*
1964 * If this is pageout don't block on the lock as you could deadlock
1965 * when freemem == 0 (another thread has the read lock and is blocked
1966 * creating a page, and a third thread is waiting to get the writers
1967 * lock - waiting writers priority blocks us from getting the read
1968 * lock). Of course, if the only freeable pages are on this tmpnode
1969 * we're hosed anyways. A better solution might be a new lock type.
1970 * Note: ufs has the same problem.
1971 */
1972 if (curproc == proc_pageout) {
1973 if (!rw_tryenter(&tp->tn_contents, RW_READER))
1974 return (ENOMEM);
1975 } else if (dolock)
1976 rw_enter(&tp->tn_contents, RW_READER);
1977
1978 if (!vn_has_cached_data(vp))
1979 goto out;
1980
1981 if (len == 0) {
1982 if (curproc == proc_pageout) {
1983 panic("tmp: pageout can't block");
1984 /*NOTREACHED*/
1985 }
1986
1987 /* Search the entire vp list for pages >= off. */
1988 err = pvn_vplist_dirty(vp, (uoff_t)off, tmp_putapage,
1989 flags, cr);
1990 } else {
1991 uoff_t eoff;
1992
1993 /*
1994 * Loop over all offsets in the range [off...off + len]
1995 * looking for pages to deal with.
1996 */
1997 eoff = MIN(off + len, tp->tn_size);
1998 for (io_off = off; io_off < eoff; io_off += io_len) {
1999 /*
2000 * If we are not invalidating, synchronously
2001 * freeing or writing pages use the routine
2002 * page_lookup_nowait() to prevent reclaiming
2003 * them from the free list.
2004 */
2005 if ((flags & B_INVAL) || ((flags & B_ASYNC) == 0)) {
2006 pp = page_lookup(&vp->v_object, io_off,
2007 (flags & (B_INVAL | B_FREE)) ? SE_EXCL : SE_SHARED);
2008 } else {
2009 pp = page_lookup_nowait(&vp->v_object,
2010 io_off,
2011 (flags & B_FREE) ? SE_EXCL : SE_SHARED);
2012 }
2013
2014 if (pp == NULL || pvn_getdirty(pp, flags) == 0)
2015 io_len = PAGESIZE;
2016 else {
2017 err = tmp_putapage(vp, pp, &io_off, &io_len,
2018 flags, cr);
2019 if (err != 0)
2020 break;
2021 }
2022 }
2023 }
2024 /* If invalidating, verify all pages on vnode list are gone. */
2025 if (err == 0 && off == 0 && len == 0 &&
2026 (flags & B_INVAL) && vn_has_cached_data(vp)) {
2027 panic("tmp_putpage: B_INVAL, pages not gone");
2028 /*NOTREACHED*/
2029 }
2030 out:
2031 if ((curproc == proc_pageout) || dolock)
2032 rw_exit(&tp->tn_contents);
2033 /*
2034 * Only reason putapage is going to give us SE_NOSWAP as error
2035 * is when we ask a page to be written to physical backing store
2036 * and there is none. Ignore this because we might be dealing
2037 * with a swap page which does not have any backing store
2038 * on disk. In any other case we won't get this error over here.
2039 */
2040 if (err == SE_NOSWAP)
2041 err = 0;
2042 return (err);
2043 }
2044
2045 long tmp_putpagecnt, tmp_pagespushed;
2046
2047 /*
2048 * Write out a single page.
2049 * For tmpfs this means choose a physical swap slot and write the page
2050 * out using fop_pageio. For performance, we attempt to kluster; i.e.,
2051 * we try to find a bunch of other dirty pages adjacent in the file
2052 * and a bunch of contiguous swap slots, and then write all the pages
2053 * out in a single i/o.
2054 */
2055 /*ARGSUSED*/
2056 static int
2057 tmp_putapage(
2058 struct vnode *vp,
2059 page_t *pp,
2060 uoff_t *offp,
2061 size_t *lenp,
2062 int flags,
2063 struct cred *cr)
2064 {
2065 int err;
2066 ulong_t klstart, kllen;
2067 page_t *pplist, *npplist;
2068 extern int klustsize;
2069 long tmp_klustsize;
2070 struct tmpnode *tp;
2071 size_t pp_off, pp_len;
2072 uoff_t io_off;
2073 size_t io_len;
2074 struct vnode *pvp;
2075 uoff_t pstart;
2076 uoff_t offset;
2077 uoff_t tmpoff;
2078
2079 ASSERT(PAGE_LOCKED(pp));
2080
2081 /* Kluster in tmp_klustsize chunks */
2082 tp = VTOTN(vp);
2083 tmp_klustsize = klustsize;
2084 offset = pp->p_offset;
2085 klstart = (offset / tmp_klustsize) * tmp_klustsize;
2086 kllen = MIN(tmp_klustsize, tp->tn_size - klstart);
2087
2088 /* Get a kluster of pages */
2089 pplist =
2090 pvn_write_kluster(vp, pp, &tmpoff, &pp_len, klstart, kllen, flags);
2091
2092 pp_off = (size_t)tmpoff;
2093
2094 /*
2095 * Get a cluster of physical offsets for the pages; the amount we
2096 * get may be some subrange of what we ask for (io_off, io_len).
2097 */
2098 io_off = pp_off;
2099 io_len = pp_len;
2100 err = swap_newphysname(vp, offset, &io_off, &io_len, &pvp, &pstart);
2101 ASSERT(err != SE_NOANON); /* anon slot must have been filled */
2102 if (err) {
2103 pvn_write_done(pplist, B_ERROR | B_WRITE | flags);
2104 /*
2105 * If this routine is called as a result of segvn_sync
2106 * operation and we have no physical swap then we can get an
2107 * error here. In such case we would return SE_NOSWAP as error.
2108 * At this point, we expect only SE_NOSWAP.
2109 */
2110 ASSERT(err == SE_NOSWAP);
2111 if (flags & B_INVAL)
2112 err = ENOMEM;
2113 goto out;
2114 }
2115 ASSERT(pp_off <= io_off && io_off + io_len <= pp_off + pp_len);
2116 ASSERT(io_off <= offset && offset < io_off + io_len);
2117
2118 /* Toss pages at front/rear that we couldn't get physical backing for */
2119 if (io_off != pp_off) {
2120 npplist = NULL;
2121 page_list_break(&pplist, &npplist, btop(io_off - pp_off));
2122 ASSERT(pplist->p_offset == pp_off);
2123 ASSERT(pplist->p_prev->p_offset == io_off - PAGESIZE);
2124 pvn_write_done(pplist, B_ERROR | B_WRITE | flags);
2125 pplist = npplist;
2126 }
2127 if (io_off + io_len < pp_off + pp_len) {
2128 npplist = NULL;
2129 page_list_break(&pplist, &npplist, btop(io_len));
2130 ASSERT(npplist->p_offset == io_off + io_len);
2131 ASSERT(npplist->p_prev->p_offset == pp_off + pp_len - PAGESIZE);
2132 pvn_write_done(npplist, B_ERROR | B_WRITE | flags);
2133 }
2134
2135 ASSERT(pplist->p_offset == io_off);
2136 ASSERT(pplist->p_prev->p_offset == io_off + io_len - PAGESIZE);
2137 ASSERT(btopr(io_len) <= btopr(kllen));
2138
2139 /* Do i/o on the remaining kluster */
2140 err = fop_pageio(pvp, pplist, (uoff_t)pstart, io_len,
2141 B_WRITE | flags, cr, NULL);
2142
2143 if ((flags & B_ASYNC) == 0) {
2144 pvn_write_done(pplist, ((err) ? B_ERROR : 0) | B_WRITE | flags);
2145 }
2146 out:
2147 if (!err) {
2148 if (offp)
2149 *offp = io_off;
2150 if (lenp)
2151 *lenp = io_len;
2152 tmp_putpagecnt++;
2153 tmp_pagespushed += btop(io_len);
2154 }
2155 if (err && err != ENOMEM && err != SE_NOSWAP)
2156 cmn_err(CE_WARN, "tmp_putapage: err %d\n", err);
2157 return (err);
2158 }
2159
2160 /* ARGSUSED */
2161 static int
2162 tmp_map(
2163 struct vnode *vp,
2164 offset_t off,
2165 struct as *as,
2166 caddr_t *addrp,
2167 size_t len,
2168 uchar_t prot,
2169 uchar_t maxprot,
2170 uint_t flags,
2171 struct cred *cred,
2172 caller_context_t *ct)
2173 {
2174 struct segvn_crargs vn_a;
2175 struct tmpnode *tp = (struct tmpnode *)VTOTN(vp);
2176 int error;
2177
2178 #ifdef _ILP32
2179 if (len > MAXOFF_T)
2180 return (ENOMEM);
2181 #endif
2182
2183 if (vp->v_flag & VNOMAP)
2184 return (ENOSYS);
2185
2186 if (off < 0 || (offset_t)(off + len) < 0 ||
2187 off > MAXOFF_T || (off + len) > MAXOFF_T)
2188 return (ENXIO);
2189
2190 if (vp->v_type != VREG)
2191 return (ENODEV);
2192
2193 /*
2194 * Don't allow mapping to locked file
2195 */
2196 if (vn_has_mandatory_locks(vp, tp->tn_mode)) {
2197 return (EAGAIN);
2198 }
2199
2200 as_rangelock(as);
2201 error = choose_addr(as, addrp, len, off, ADDR_VACALIGN, flags);
2202 if (error != 0) {
2203 as_rangeunlock(as);
2204 return (error);
2205 }
2206
2207 vn_a.vp = vp;
2208 vn_a.offset = (uoff_t)off;
2209 vn_a.type = flags & MAP_TYPE;
2210 vn_a.prot = prot;
2211 vn_a.maxprot = maxprot;
2212 vn_a.flags = flags & ~MAP_TYPE;
2213 vn_a.cred = cred;
2214 vn_a.amp = NULL;
2215 vn_a.szc = 0;
2216 vn_a.lgrp_mem_policy_flags = 0;
2217
2218 error = as_map(as, *addrp, len, segvn_create, &vn_a);
2219 as_rangeunlock(as);
2220 return (error);
2221 }
2222
2223 /*
2224 * tmp_addmap and tmp_delmap can't be called since the vp
2225 * maintained in the segvn mapping is NULL.
2226 */
2227 /* ARGSUSED */
2228 static int
2229 tmp_addmap(
2230 struct vnode *vp,
2231 offset_t off,
2232 struct as *as,
2233 caddr_t addr,
2234 size_t len,
2235 uchar_t prot,
2236 uchar_t maxprot,
2237 uint_t flags,
2238 struct cred *cred,
2239 caller_context_t *ct)
2240 {
2241 return (0);
2242 }
2243
2244 /* ARGSUSED */
2245 static int
2246 tmp_delmap(
2247 struct vnode *vp,
2248 offset_t off,
2249 struct as *as,
2250 caddr_t addr,
2251 size_t len,
2252 uint_t prot,
2253 uint_t maxprot,
2254 uint_t flags,
2255 struct cred *cred,
2256 caller_context_t *ct)
2257 {
2258 return (0);
2259 }
2260
2261 static int
2262 tmp_freesp(struct vnode *vp, struct flock64 *lp, int flag)
2263 {
2264 register int i;
2265 register struct tmpnode *tp = VTOTN(vp);
2266 int error;
2267
2268 ASSERT(vp->v_type == VREG);
2269 ASSERT(lp->l_start >= 0);
2270
2271 if (lp->l_len != 0)
2272 return (EINVAL);
2273
2274 rw_enter(&tp->tn_rwlock, RW_WRITER);
2275 if (tp->tn_size == lp->l_start) {
2276 rw_exit(&tp->tn_rwlock);
2277 return (0);
2278 }
2279
2280 /*
2281 * Check for any mandatory locks on the range
2282 */
2283 if (MANDLOCK(vp, tp->tn_mode)) {
2284 long save_start;
2285
2286 save_start = lp->l_start;
2287
2288 if (tp->tn_size < lp->l_start) {
2289 /*
2290 * "Truncate up" case: need to make sure there
2291 * is no lock beyond current end-of-file. To
2292 * do so, we need to set l_start to the size
2293 * of the file temporarily.
2294 */
2295 lp->l_start = tp->tn_size;
2296 }
2297 lp->l_type = F_WRLCK;
2298 lp->l_sysid = 0;
2299 lp->l_pid = ttoproc(curthread)->p_pid;
2300 i = (flag & (FNDELAY|FNONBLOCK)) ? 0 : SLPFLCK;
2301 if ((i = reclock(vp, lp, i, 0, lp->l_start, NULL)) != 0 ||
2302 lp->l_type != F_UNLCK) {
2303 rw_exit(&tp->tn_rwlock);
2304 return (i ? i : EAGAIN);
2305 }
2306
2307 lp->l_start = save_start;
2308 }
2309 VFSTOTM(vp->v_vfsp);
2310
2311 rw_enter(&tp->tn_contents, RW_WRITER);
2312 error = tmpnode_trunc((struct tmount *)VFSTOTM(vp->v_vfsp),
2313 tp, (ulong_t)lp->l_start);
2314 rw_exit(&tp->tn_contents);
2315 rw_exit(&tp->tn_rwlock);
2316 return (error);
2317 }
2318
2319 /* ARGSUSED */
2320 static int
2321 tmp_space(
2322 struct vnode *vp,
2323 int cmd,
2324 struct flock64 *bfp,
2325 int flag,
2326 offset_t offset,
2327 cred_t *cred,
2328 caller_context_t *ct)
2329 {
2330 int error;
2331
2332 if (cmd != F_FREESP)
2333 return (EINVAL);
2334 if ((error = convoff(vp, bfp, 0, (offset_t)offset)) == 0) {
2335 if ((bfp->l_start > MAXOFF_T) || (bfp->l_len > MAXOFF_T))
2336 return (EFBIG);
2337 error = tmp_freesp(vp, bfp, flag);
2338
2339 if (error == 0 && bfp->l_start == 0)
2340 vnevent_truncate(vp, ct);
2341 }
2342 return (error);
2343 }
2344
2345 /* ARGSUSED */
2346 static int
2347 tmp_seek(
2348 struct vnode *vp,
2349 offset_t ooff,
2350 offset_t *noffp,
2351 caller_context_t *ct)
2352 {
2353 return ((*noffp < 0 || *noffp > MAXOFFSET_T) ? EINVAL : 0);
2354 }
2355
2356 /* ARGSUSED2 */
2357 static int
2358 tmp_rwlock(struct vnode *vp, int write_lock, caller_context_t *ctp)
2359 {
2360 struct tmpnode *tp = VTOTN(vp);
2361
2362 if (write_lock) {
2363 rw_enter(&tp->tn_rwlock, RW_WRITER);
2364 } else {
2365 rw_enter(&tp->tn_rwlock, RW_READER);
2366 }
2367 return (write_lock);
2368 }
2369
2370 /* ARGSUSED1 */
2371 static void
2372 tmp_rwunlock(struct vnode *vp, int write_lock, caller_context_t *ctp)
2373 {
2374 struct tmpnode *tp = VTOTN(vp);
2375
2376 rw_exit(&tp->tn_rwlock);
2377 }
2378
2379 static int
2380 tmp_pathconf(
2381 struct vnode *vp,
2382 int cmd,
2383 ulong_t *valp,
2384 cred_t *cr,
2385 caller_context_t *ct)
2386 {
2387 struct tmpnode *tp = NULL;
2388 int error;
2389
2390 switch (cmd) {
2391 case _PC_XATTR_EXISTS:
2392 if (vp->v_vfsp->vfs_flag & VFS_XATTR) {
2393 *valp = 0; /* assume no attributes */
2394 error = 0; /* okay to ask */
2395 tp = VTOTN(vp);
2396 rw_enter(&tp->tn_rwlock, RW_READER);
2397 if (tp->tn_xattrdp) {
2398 rw_enter(&tp->tn_xattrdp->tn_rwlock, RW_READER);
2399 /* do not count "." and ".." */
2400 if (tp->tn_xattrdp->tn_dirents > 2)
2401 *valp = 1;
2402 rw_exit(&tp->tn_xattrdp->tn_rwlock);
2403 }
2404 rw_exit(&tp->tn_rwlock);
2405 } else {
2406 error = EINVAL;
2407 }
2408 break;
2409 case _PC_SATTR_ENABLED:
2410 case _PC_SATTR_EXISTS:
2411 *valp = vfs_has_feature(vp->v_vfsp, VFSFT_SYSATTR_VIEWS) &&
2412 (vp->v_type == VREG || vp->v_type == VDIR);
2413 error = 0;
2414 break;
2415 case _PC_TIMESTAMP_RESOLUTION:
2416 /* nanosecond timestamp resolution */
2417 *valp = 1L;
2418 error = 0;
2419 break;
2420 default:
2421 error = fs_pathconf(vp, cmd, valp, cr, ct);
2422 }
2423 return (error);
2424 }
2425
2426
2427 const struct vnodeops tmp_vnodeops = {
2428 .vnop_name = "tmpfs",
2429 .vop_open = tmp_open,
2430 .vop_close = tmp_close,
2431 .vop_read = tmp_read,
2432 .vop_write = tmp_write,
2433 .vop_ioctl = tmp_ioctl,
2434 .vop_getattr = tmp_getattr,
2435 .vop_setattr = tmp_setattr,
2436 .vop_access = tmp_access,
2437 .vop_lookup = tmp_lookup,
2438 .vop_create = tmp_create,
2439 .vop_remove = tmp_remove,
2440 .vop_link = tmp_link,
2441 .vop_rename = tmp_rename,
2442 .vop_mkdir = tmp_mkdir,
2443 .vop_rmdir = tmp_rmdir,
2444 .vop_readdir = tmp_readdir,
2445 .vop_symlink = tmp_symlink,
2446 .vop_readlink = tmp_readlink,
2447 .vop_fsync = tmp_fsync,
2448 .vop_inactive = tmp_inactive,
2449 .vop_fid = tmp_fid,
2450 .vop_rwlock = tmp_rwlock,
2451 .vop_rwunlock = tmp_rwunlock,
2452 .vop_seek = tmp_seek,
2453 .vop_space = tmp_space,
2454 .vop_getpage = tmp_getpage,
2455 .vop_putpage = tmp_putpage,
2456 .vop_map = tmp_map,
2457 .vop_addmap = tmp_addmap,
2458 .vop_delmap = tmp_delmap,
2459 .vop_pathconf = tmp_pathconf,
2460 .vop_vnevent = fs_vnevent_support,
2461 };
Unleashed OS